package com.changgou.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.goods.pojo.Sku;
import com.changgou.search.SkuInfo;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {
    @Autowired/**/
    private ElasticsearchTemplate elasticsearchTemplate;
    @Override
    public Map search(Map<String, String> paramMap) throws Exception  {
        Map resultMap = new HashMap<>();
        //首先判断是否传值
        if(paramMap != null) {
            //获取组合对象
            BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
            //获取关键词
            if (!StringUtils.isEmpty(paramMap.get("keyword"))) {
                boolQuery.must(QueryBuilders.matchQuery("name", paramMap.get("keyword")).operator(Operator.AND));

            }
            //根据品牌条件搜索
            if(StringUtils.isNotEmpty(paramMap.get("brand"))){
                boolQuery.filter(QueryBuilders.termQuery("brandName",paramMap.get("brand")));
            }
            //根据规格条件查询
            for (String key : paramMap.keySet()) {
                if (key.startsWith("spec_")){
                    String value = paramMap.get(key).replace("%2B", "+");
                    boolQuery.filter(QueryBuilders.termQuery("specMap." + key.substring(5) + ".keyword",value));
                }
            }
            //按价格的区间查询
            if(StringUtils.isNotEmpty(paramMap.get("price"))){
                String[] prices = paramMap.get("price").split("-");
                if(prices.length == 2){
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
                }
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
            }
            //原生搜索的实现类
            NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
            nativeSearchQueryBuilder.withQuery(boolQuery);

            //对品牌进行聚合(分组)操作
             String  skuBrand = "skuBrand ";
             nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));
             //对规格进行聚合操作
            String  skuSpec  = "skuSpec ";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

            //排序
            if(StringUtils.isNotEmpty(paramMap.get("sortField"))){
                if("ASC".equals(paramMap.get("sortRule"))){
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(paramMap.get("sortField")).order(SortOrder.ASC));
                }else{
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(paramMap.get("sortField")).order(SortOrder.DESC));
                }
            }
            //高亮
            HighlightBuilder.Field field = new HighlightBuilder.Field("name").preTags("<span style='color:red'>").postTags("</span>");
             nativeSearchQueryBuilder.withHighlightFields(field);
            //分页参数
             String pageNum = paramMap.get("pageNum");
             String pageSize = paramMap.get("pageSize");
             if (StringUtils.isEmpty(pageNum)){
                  pageNum = "1";
             }
            if (StringUtils.isEmpty(pageSize)){
                pageSize = "20";
            }
            //分页
            nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum)-1,Integer.parseInt(pageSize)));


            AggregatedPage<SkuInfo> aggregatedPage  = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
                @Override
                public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {

                    List<T> list = new ArrayList<>();

                    SearchHits hits = searchResponse.getHits();
                    if (null != hits) {
                        for (SearchHit hit : hits) {
                            SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

                            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                            if (null != highlightFields && highlightFields.size() > 0) {
                                skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                            }
                            list.add((T) skuInfo);
                        }
                    }
                    return new AggregatedPageImpl<T>(list, pageable, hits.getTotalHits(), searchResponse.getAggregations());
                }
            });

            //11. 总条数
            resultMap.put("total", aggregatedPage.getTotalElements());
            //12. 总页数
            resultMap.put("totalPages", aggregatedPage.getTotalPages());
            //13. 查询结果集合
            resultMap.put("rows", aggregatedPage.getContent());
           //16. 返回当前页
            resultMap.put("pageNum", pageNum);



            //14. 获取品牌聚合结果
            StringTerms brandTerms = (StringTerms) aggregatedPage.getAggregation(skuBrand);
            List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList", brandList);

            //15. 获取规格聚合结果
            StringTerms specTerms = (StringTerms) aggregatedPage.getAggregation(skuSpec);
            List<String> specList = specTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("specList", specList);

            return resultMap;
        }
        return null;
    }
}
